Comedians aren't generally known for their chiselled looks and toned bodies.But it appears American funnyman Dane Cook is breaking the mould as he displayed his impressive physique on holiday.The Good Luck Chuck star, 39, showed off the results of his gym sessions as he frolicked in the Pacific with his mystery brunette girlfriend.

Buff: Comedian Dane Cook and his mystery brunette girlfriend show off their impressive physiques on the beach in Hawaii yesterday

As a stand-up comedian-turned-actor, fans are used to seeing Cook fully-clothed.But as he peeled off for a day on the beach, it looks like he may be winning over some new female fans.

Followers of his Twitter page will know the comedian works on his fitness, regularly visiting the gym and going for runs in the canyons of Los Angeles.

Come on in, the water's lovely: Cook appeared to be in his element splashing about in the powerful Pacific

New love? Cook lavished attention on his bikini-clad lover as the cuddled in the sea

While Cook has been opened about his keep-fit regime, he is yet to divulge who he is dating.Earlier this month, he teased: 'I think I'm in love for the first time in a long time.'But the couple certainly seemed to be into each other as they kissed and cuddled in the surf.

Who's that girl? Cook's brunette girlfriend showed off her amazing figure in a purple halterneck bikini

'I think I'm in love': Cook has dropped a few hints about his lovelife, but is yet to reveal his girlfriend's identity

Ahead of his trip to Hawaii, he tweeted: 'It's official. For the 1st time in 2 years I'm on vacation. Twittering from one of the most beautiful spots on the planet. Thankful.'After years on the stand-up circuit, Cook landed his first big film role in Employee Of The Month in 2006.It was there he starred alongside Jessica Simpson, who he was also romantically linked to at the time.

Keeping fit: Cook keeps in shape with regular trips to the gym and running in the canyons surrounding Los Angeles

They remain good friends and Simpson was spotted attending one of Cook's comedy gigs earlier this year.When she announced her engagement to Eric Johnson, Cook said: 'Jessica's a great friend of mine and I'm so happy for her! She's an incredible person and that's great, great news for her. I send out a big well wish to "Special J" as we lovingly call her.'Cook also dated dancer/actress Julianne Hough before she met current beau Ryan Seacrest.

Check out that wave: Cook appeared to be enjoying the sights of Hawaii in more ways than one